I am 68 years old and I lost my job with $200,000 in my IRA rolled over from my 103B and I don't have social security and no other income. I have $20,000 credit card debt. Can they garnish my only source of income, my IRA

This depends on your state law. In general, if you declare bankruptcy your qualified retirement plans like 401(k)'s, and rollover IRAs established with funds from a qualified retirement plan are protected from creditors (except for the IRS), and traditional IRAs are protected up to $1M. If you have not declared bankruptcy, then state law determines whether your IRA is protected.